One Piece (Just epic. No words can describe it)
Bleach (I only watched up to 200th episode but from what I remember the placement and stuff was pretty good. Especially the "If you wanna see some action" song )
FMA (both the series had awesome soundtracks)
Darker than Black (Also amazing)
Death Note (the opening and ending didn't make much sense but the "in anime" music was awesome nonetheless)
Persona 4 (although I prefer persona 3's OST but that never got an anime so I will have to do with P4 )

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